EMG signals detection and processing for on-line control of functional electrical stimulation

C. Frigo, M. Ferrarin, W. Frasson, E. Pavan, R. Thorsen

Research output: Contribution to journalArticlepeer-review


The surface EMG signal detected from voluntarily activated muscles can be used as a control signal for functional neuromuscular electrical stimulation. A proper positioning of the recording electrodes in relation to the stimulation electrodes, and a proper processing of the recorded signals is required to reduce the stimulus artefact and the non-voluntary contribution (M-wave). Six orientations and six locations of the recording electrodes were investigated in the present work. A comb filter (with and without a blanking windowing) was applied to remove the signal components synchronously correlated to the stimulus. An operative definition of the signal to noise ratio and an efficiency index were implemented. It resulted that when the recording electrodes were located within the two stimulation electrodes the best orientation was perpendicular to the longitudinal line. However the best absolute indexes were obtained when the recording electrodes were located externally of the stimulation electrodes, and in that case the best orientation was longitudinal. Concerning the filtering procedure, the use of a blanking window before the application of the comb filter, gave the best performance. Copyright (C) 2000 Elsevier Science Ltd.

Original languageEnglish
Pages (from-to)351-360
Number of pages10
JournalJournal of Electromyography and Kinesiology
Issue number5
Publication statusPublished - Oct 2000


  • Electrode placement
  • EMG signal processing
  • FES control
  • Surface EMG

ASJC Scopus subject areas

  • Orthopedics and Sports Medicine


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